Biden vs Putin is just one more example of how worldwide, socialists just do not get along with each other.
Putin and Xi have been having problems all along, most recently with their own borders. They are more friends by necessity, and they make the other pay for it when they have the leverage.
True. Stalin hated Mao. He would have preferred to have Chiang running China (and did support the KMT until he signed the non-aggression pact with Japan).